
\chapter{Wireless communication}
\begin{intro}
The first part of this chapter presents \ldots
\end{intro}
\par{\textit {this is the first time} \Huge {i learn to use vim!It's fantestic!}}
\newtheorem{law}{Law}
\newtheorem{jury}[law]{Jury}
\begin{law}\label{law:box1}
This is Law1.
\end{law}
\begin{jury}[The Twelve]\label{law:box2}
This is Law2.See law ~\ref{law:box1}
\end{jury}
\begin{law}
Never give up!~\cite{sunqi}Face the problem!
\end{law}
come on !baby!~\ref{law:box2}~\cite{manual}
\begin{figure}[htbp]
\centering
\includegraphics[scale=0.5]{../fig/sin}
\caption{figure made by python}~\label{fig:sin}
\end{figure}
